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Free online tools & calculators,
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Percentages, dates, loans, health, construction and AI costs. Every tool runs in your browser — nothing to install, nothing uploaded.

164 free calculators, and counting.

Messi vs Ronaldo: goals over a career

Every season, goal by goal, club and country. Drag the timeline to compare the two.

Deep dives behind the calculators — our newest reads.

Why the scale is logarithmic — each point about 32× more energy — why the figures get revised, and how big the largest quakes were.

Why some groups rise while others fall at once, the factors behind it, and which tools help you plan in either arm.

Each category with its newest tools first — open one to see everything in it.